[YouTube] Fix throttling parameter decryption on Android

Escape the curly brace in the regular expression used to parse the throttling
parameter decryption function to allow its compatibility on Android.

Author: Theta-Dev

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingDecrypter.java

@@ -137,7 +137,10 @@ private static String parseWithParenthesisMatching(final String playerJsCode,
     @Nonnull
     private static String parseWithRegex(final String playerJsCode, final String functionName)
             throws Parser.RegexException {
-        final Pattern functionPattern = Pattern.compile(functionName + "=function(.*?};)\n",
+        // Escape the curly end brace to allow compatibility with Android's regex engine
+        // See https://stackoverflow.com/q/45074813
+        //noinspection RegExpRedundantEscape
+        final Pattern functionPattern = Pattern.compile(functionName + "=function(.*?\\};)\n",
                 Pattern.DOTALL);
         return validateFunction("function "
                 + functionName